With free music downloads and paid mobile music downloads growing, this infographic stacks out how it's all happening. Some of the notable numbers include: almost 80% of Pandora Radio use is done via mobile music, while spending on the music itself has grown by big chunks year-over-year since 2007. It's estimated that $50.4 billion dollars will be spent this year alone.

Other breakouts: 31% of smartphone music listeners stream their music, while 20% of tablet users stream. This represents the big growth area in the future ... as more people become comfortable with mobile streaming music services and how they can provide mobile music listeners with at home or on the go options for streaming radio.